Billionaire investor Warren Buffett has given away Berkshire Hathaway shares worth over $1.3 billion (₹11,530 crore) to four family charities as he wrote his last annual shareholder letter. "As Thanksgiving approaches, I'm grateful and surprised by my luck in being alive at 95. When I was young, this outcome didn't look like a good bet," the 'Oracle of Omaha' wrote.